Draw works



y 1941- H. w. CARDWELL 247,606

DRAW worms I Filed Feb. 25, 1958 2 Sheets-Sheet l mama/1 [am/Quail July 1, 1941. H. w. CARDWELL DRAW WQRKS Filed Feb. 25; 1938 2 Sheets-Shes; 2

Patented July 1, 1941 NITED STTES DRAW WORKS Harland W. Cardwell, Wichita, Kans., assignor to Cardwell Manufacturing Company, Inc., a corporation of Kansas 2 Claims.

This invention relates to new and useful improvements in draw works and more particularly is concerned with improved drive or control means therefor.

A primary object of the invention is to provide novel means for operating the draw works whereby a more positive and efficient control of the various shafts or drums may be effected.

Another object of the invention is to provide a compactly arranged draw works unit which is capable of operating either rotary or cable tools.

A further object of the invention i to provide a draw works which is extremely simple in construction and arrangement but which is more efficient in service than devices heretofore produced.

Other and further advantages will be apparent from the following detailed description taken in conjunction with the accompanying drawings wherein a preferred embodiment of the principles of the invention has been selected for exemplification.

In the drawings:

Figure 1 is a side elevational view of a draw works embodying the principles of the invention Figure 2 is a View taken on line 22 of Fig. 1 and showing the operating parts of the draw works of Fig. 1 in front elevation; and

Figure 3 is a fragmentary sectional view diagrammatically illustrating the clutch for effecting a drive of the power takeoff.

Referring more particularly to the drawings wherein like numerals refer to like parts, the draw works chassis is composed of a pair of parallel skid supports 5. Secured to each skid support 5 intermediate the ends thereof is a framework comprising a pair of upright beams l which are oppositely disposed. The beams in each pair are angularly arranged with respect to each other to substantially form an inverted V with the upper ends of the beams suitably connected.

Carried at the opposite end of the chassis 5 is a prime mover designated at A which may take the form of an internal combustion engine or an electric motor or the like.

The apparatus illustrated is a double drum unit and the shaft H] has a lower or drilling drum 1 I secured thereto and is mounted by means of suitable bearings upon the frame l. The upper shaft 12 may be likewise mounted upon the frame 1 at the upper portion thereof.

Disposed at either or both ends of the shaft [2 are catheads l4, and in the construction illustrated an upper drum I 3 is mounted upon the shaft, which upper drum may be used for operation of a wire line core barrel, surveying instruments, sand line, or the like. Both drums may, if desired, operate independently of the shafts.

The invention, however, contemplates a single as well as a double drum draw works and, if desired, the drum i3 may be omitted and the shaft l2 used for operation of the catheads it only.

Disposed rearwardly of the shafts if! and i2 and forwardly of the prime mover A is a countershaft [5 mounted upon the frame 1 by means of suitable bearings. The countershaft I 6 carries a pair of friction clutches designated at l8 and 23, which friction clutches are intended to drive the lower drum H and the cathead shaft l2 or upper drum l3, respectively. The friction clutches may be of any suitable construction but preferably are of the contracting band type as disclosed in my copending application, Serial No. 147,748, filed June 11, 1937, Patent No. 2,213,361, dated September 3, 1940.

Countershaft I5 is driven by the prime mover A by means of a sprocket wheel 22 suitably keyed to the shaft over which is trained sprocket chain 24, which in turn is connected with a sprocket wheel carried by the engine drive shaft.

Suitable means are provided for driving the lower and upper shafts l0 and I2 from the countershaft I6 and for this purpose sprocket wheels 26 and 28 are carried by the countershaft and lower drum shaft I0, respectively, and over which sprockets is trained a sprocket chain 29. Similarly, sprocket wheels 30 and 32 are carried by the countershaft and upper shaft l 2 respectively, and trained thereover is a sprocket chain 33.

It will be noted that the upper and lower shaft or drum drive connecting means are each associated with a friction clutch whereby the cathead or drum shafts may be very efficiently operated at any relative speeds or in any manner found desirable.

The drum works illustrated is adapted for any of the conventional operations and, if desired, spudding apparatus, as for example that disclosed in my prior Patent 2,028,697, granted on January 21, 1936, may be assembled with the draw works, or it is equally adaptable for beam drilling, for which purpose a header 35 is shown to provide for suitable support for the drilling beam. Also, the draw works is adaptable for rotary drilling and for this purpose a power takeoff, indicated by P is rotatably mounted upon the lower drum shaft ID. This power takeoff comprises a compound sprocket providing, in effect, two sprocket wheels 33 and 33. The

sprocket 38 is driven by a chain 40 trained over a sprocket 22a formed integral with one element of a clutch 2%, as best shown in Figure 3. The clutch element 221) is cooperable with a clutch element 220 suitably mounted upon the sprocket 22 which is secured to the countershaft I6 and driven from the prime mover A. Thus, it will be apparent that so long as the countershaft 16 is rotating and the clutch ,elements 22b22c are engaged, the sprocket 38 will be operated by the chain 46 and power may be taken off the sprocket 36 through any suitable chain to drive a rotary drilling table (not shown) independently of the operation of the upper and lower drums H and I 3. The clutch associated with the sprocket 22a is diagrammatically shown, and it will be understood that the same may be operated by any suitable means.

The friction clutches l8 and 2i) contribute highly useful and novel advantages. For example, when operating a rotary table it is often necessary to pick up the drill pipe in order to correct the weight as shown by the weight indicator and, with prior draw works it would be necessary to stop the rotary table, engage the jaw clutch in the drum, pick up the pipe to the proper distance, disengage the jaw clutch and engage another clutch to again start the rotary table. With the draw works of the present invention, however, the jaw clutch in the drum may be left engaged and the drill pipe picked up by engaging the friction clutch on the countershaft without stopping the rotary table. EX- emplary further, an automatic cathead is not necessary with a friction clutch operated cathead shaft and, when the upper drum is employed for a bailing operation, the bailer may be readily churned up and down thus to become filled with sediment or cuttings. Other and further advantages will become apparent from the foregoing disclosure and operation of devices embraced by the invention.

I claim:

1. In a draw works, the combination of a countershaft, a friction clutch mounted upon said countershaft adjacent one end thereof, a sprocket associated with said friction clutch, a lower drum shaft, a drum secured to said lower drum shaft, a sprocket fixed to said lower drum shaft, a chain for driving the sprocket on said lower drum shaft from the sprocket associated with said friction clutch, a second friction clutch on said countershaft adjacent the opposite end thereof, a sprocket associated with said second friction clutch, an upper drum shaft, a drum secured to said upper drum shaft, a sprocket fixed to said upper drum shaft, and a chain for driving said sprocket from the sprocket associated with said second friction clutch, a sprocket fixed on said countershaft, a power takeoff rotatably mounted on said lower drum shaft, and means for driving said power takeoff from the sprocket fixed on said countershaft, whereby said power takeoff may be utilized for driving a rotary drilling assembly and said drum shafts may be selectively operated during the driving of said drilling assembly without interrupting the drive to said power takeoff.

2. In a draw works, the combination of a countershaft; a pair of friction clutches mounted upon said countershaft; a shaft carrying a cable drum thereon; means for driving said drum directly from said countershaft through one of said friction clutches; a second shaft adapted to carry a drum, a cathead, or both; means for driving said second shaft directly from said countershaft through the other of said friction clutches; a power takeoff rotatably mounted upon said drum-carrying shaft; and means also on said countershaft for driving said power takeoff, whereby said power takeoff may be utilized for driving a rotary drilling assembly and said drum shaft and said second shaft may be selectively operated through said friction clutches during the driving of said drilling assembly and whereby said drum is operable to effect an accurate adjustment of a drilling cable without necessitating an interruption of the drive of said power takeoff.

HARLAND W. CARDWELL. 

